Instruction manual
AL-800 Instruction Manual
28
7.)
NEVER
make any unauthorized component or circuit modifications to this product. The only
acceptable source for modifications is Ameritron or a source approved by Ameritron.
Unauthorized modifications almost certainly will
increase
the risk of equipment failure or
personal injury.
The cover should be removed and a low value (40 to 500 ohm) two-watt or larger resistor should be
secured to the chassis. The other end of this resistor should be connected to the tube anode with an
insulated clip lead.
CAUTION:
NEVER ground the anode directly to the chassis without a series resistor.
Component damage may occur from the current surge.
Note:
This resistor is a safety device that must be installed when beginning service work and
removed when the work is finished.
Dust and dirt can be blown out of the amplifier with a shop vacuum or a high-pressure air hose. A
soft bristle brush dipped in alcohol can be used to clean particularly dirty areas. If the amplifier is
operated in a dusty environment, a non-conductive low- restriction foam air filter can be placed
over the ventilation holes on the left side of the cabinet near the filter capacitors. Placing an air filter
over these air inlet holes will substantially reduce the amount of dust entering the cabinet. Most
hardware stores stock suitable air filter material that are used as replacement filters for window air
conditioners.
Parts List
Timer / Overload Board (50-0117-2)
Designator Description Ameritron P/N
C501-506
.01 uF 50 V disc
200-0416
C507,508
.47 uF tantalum
203-0530
C509
100 uF 25 V
203-0564
D501, 502
1N4001
300-0266
D503
5.6 V zener
301-710
IC501
LM 358 dual op-amp
311-0724
Q501
NPN transistor MJF3055
305-3055
Q502, 504
PNP transistor 2N3906
307-0722
Q503, 505
NPN transistor 2N3904
305-0645
R501-503
10k 1/2 W
101-0643
R504, 505
3.3k 1/4 W
100-0729
R506, 508
680 ohm 1/4 W
100-0532
R507
1.8k 1/4 W
100-0728
R509
1 meg 1/4 W
100-0730
R510
1k 1/4 W
100-0727
R511
180 ohm 1/2 W
101-0384
R512, 513 4.7k 1/4 W 100-3470
R514, 515 470 ohm 1/4 W 100-2470
RLY501
DPDT 12 V dip relay
408-2135